Support physical units for BOM lines

[SchrodingersGat]

• Closes [Feature] Support physical units for BOM lines #4922

This PR implements support for physical units in BOM items.

Breaking Change

The "quantity" field on the BOMItem model is now calculated based on the provided "raw_amount" field - any plugins which are trying to write directly to the "quantity" field will experience errors.

Plugins should either write to the "raw_amount" field directly, or use the new "set_quantity" helper method on the BOMItem model.

API Change

This PR introduces a new "raw_amount" field to the BomItem API - which is preferenced over the "quantity" field. However, if only the "quantity" field is provided, it will be used, to allow backwards compatibility with existing systems.

Tasks

• Data / schema migrations
• Update serializers and API endpoints
• Continue to allow write to "quantity" field (if "raw_amount" field not present)
• Logic for validating raw amount
• Update existing unit tests
• Additional unit tests for physical unit / quantity validation
• Additional playwright tests
• Update documentation
• Update CHANGELOG.md
• Update "wireviz" plugin to allow specification in raw amount values - Do not use BulkCreate inventree-wireviz#60
• Perform data migration on demo dataset - Bom units demo-dataset#108
• Add non-numeric raw-amount values to demo dataset (for testing) - Bom units demo-dataset#108

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[codecov]

Codecov Report

❌ Patch coverage is 83.96226% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.33%. Comparing base (40b67f5) to head (f5483b1).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11631      +/-   ##
==========================================
- Coverage   91.34%   91.33%   -0.02%     
==========================================
  Files         967      968       +1     
  Lines       50277    50357      +80     
==========================================
+ Hits        45928    45996      +68     
- Misses       4349     4361      +12     

Flag	Coverage Δ
backend	89.23% <83.96%> (-0.01%)	⬇️

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Components	Coverage Δ
Backend Apps	91.69% <83.65%> (-0.02%)	⬇️
Backend General	93.41% <ø> (ø)
Frontend	∅ <ø> (∅)

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